Probably GCC-13.x and on-wards uses "-fmerge-constants" to merge
the const section (string/floating-point) across compilation units.
This makes it difficult to properly analyze the size output of rodata
section across libraries, the merged section (big in size) is showed
across a single library.
The config option added here can help to disable this compiler behavior
and help to provide better size analysis. It can be used during
development phase only as it increases rodata section size.
The documentation for the IDF Size tool has been relocated from the
performance section to the tools section and updated to reflect the
current refactored version of esp-idf-size.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
